If something did, indeed, happen to you, regarding a Peter Omagbemi and all the other information (Court Docket Number, etc.) were correct, it sounds legitimate. However, if nothing was ever done to you by this person and there is no case pending, it certainly does sound like a scam. If she asked for your email address, so she could send you an email, and you gave it to her, if nothing ever comes via email, and nothing ever happened to you, forget about it. I hope she didn't ask/you didn't give her any other personal information if you weren't sure if she was legitimate.
If you want to inquire about this person and the situation more in depth, you can contact the USPS and ask if she is, indeed, a U.S. Postal Inspector. 1(###) ###-####/a>